Round end buttonhole mechanism for zigzag sewing machines



y 7, 1970 J. BLACKWOOD ET AL 3,518,954

ROUND END BUTTONHOLE MECHANISM FOR ZIGZAG SEWING MACHINES l t e e h a S e h S 4 8 6 9 1 I l 2 e n u J d e 1 1- F INVENTORS John- Blackwood, BY John I, Patricia and Donulo P. Buon 'T o R NL E;

WITNESS: wuw ddzed g y 7, 1970 J. BLACKWOOD ET L 3,518,954

ROUND END BUTTONHOLE MECHANISM FOR ZIGZAG SEWING MACHINES Filed June 21. 1968 4 Sheets-Sheet 2 0 h r0 Q 2 PM .9

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I'NVENTORS John Bluckvyood, BY John Potrlclo and Dunllo F? Bucln WITNESS: 4mm damp/4% ATT RNEY July 7, 1970 J. BLACKWOOD ET AL 5,518,954

ROUND END BUTTONHOLE MECHANISM FOR ZIGZAG SEWING MACHINES Filed June 21. 1968 4 Sheets-Sheet 5 INVENTORS John Blockwpod, John Pmricm 0nd Donilo F? Buon WITNESS: 43 d/OvbL'JckcM AT R NEY y 1970 J. BLACKWOOD ET AL 3,518,954

ROUND END BUTTONHOLE MECHANISM FOR ZIGZAG SEWING MACHINES Filed June 21. 1968 4 Sheets-Sheet 4 STITCH WIDTH INVENTORS John Blockwood,

John Potrlclu BY 0nd Domllo F. Bucm WITNESS; and; acggeaza z v A TORN Patented July 7, 1970 3,518,954 ROUND END BUTTONHOLE MECHANISM FOR ZIGZAG SEWING MACHINES John Blackwood, Linden, John Patricia, Elizabeth, and Danilo P. Buan, Old Bridge, N.J., assignors to The Singer Company, Rockefeller Plaza, N.Y., a corporation of New Jersey Filed June 21, 1968, Ser. No. 739,051 Int. Cl. D]: 3/02 U.S. Cl. 112-158 7 Claims ABSTRACT OF THE DISCLOSURE A compact buttonholing assembly is provided separate and remote from the needle jogging mechanism of a household zigzag sewing machine. The buttonholing assembly, upon operator initiation of each half of a buttonhole stitching operation, is driven by the sewing machine actuating mechanism to shift a single operating member. By the setting of a single switching device, the operating member may be coupled to all of the sewing machine controls requiring variation during the stitching of the buttonhole.

BACKGROUND OF THE INVENTION This invention relates to a buttonholing unit which may be applied to any household zigzag sewing machine having controls for the width and the lateral position of needle jogging and controls for forward and reverse direction of the feed of the work being stitched.

It has long been recognized that a buttonhole which comprises four parts, i.e., the opposite ends and the opposite side stitches, may be formed on a zigzag sewing machine by eflfecting manual setting of the various machine controls at each of the four stages of buttonhole stitch formation. With this arrangement, however, buttonhole stitching is a tedious operation and the appearance of the buttonhole reflects the skill and dexterity of the machine operator.

It is also known in the art to provide buttonholing mechanisms associated as a part of the pattern carn arrangement for the needle jogging and work feeding mechanism of the sewing machine for automatically varying the pattern cam operation so as to produce buttonhole stitch formation. These mechanisms introduce further complexity into the already critical area of the patterning mechanism of a zigzag machine and therefore, involve considerable expense.

SUMMARY OF THE INVENTION It is an object of this invention to provide a buttonholing device for a household zigzag machine which buttonholing device is distinct and preferably remote from the zigzag mechanism of the machine. The buttonholing device comprises a mechanism effective upon signal initiated by the machine operator for shifting a single operating member which may be coupled to the needle jogging and work feeding controls so as to effect the stitching sequence necessary for the formation of the buttonhole.

With the above and additional objects and advantages in view as will hereinafter appear, this invention comprises the devices, combinations, and arrangements of parts hereinafter described and illustrated in the accompanying drawings of a preferred embodiment in which:

FIG. 1 is a front elevational view of a sewing machine with portions of the machine frame broken away illustrating the device of this invention applied thereto,

FIG. 2 is a top plan view of the sewing machine of FIG. 1 with the top cover removed and portions of the machine frame broken away,

FIGS. 3A, 3B, 3C and 3D represent in sequence, the manner in which the stitching of a buttonhole is accomplished using the device of this invention,

FIG. 4 is a perspective view of the buttonholing device of this invention together with fragments of the sewing machine mechanism with which the buttonholing device cooperates,

FIG. 5 is an elevational view of the ratchet wheel cam member of the buttonholing device,

FIG. 6 is a cross sectional view of the sewing machine bed taken substantially along line 6-'6- of FIG. 1,

FIG. 7 is a cross sectional view of the buttonholing device taken substantially along line 77 of FIG. 1,

FIG. 8 is a cross sectional view of the coupling between the buttonholing device and the sewing machine control linkages taken substantially along line 8-8 of FIG. 2, and

FIG. 9 is an elevational view of the control panel of the sewing machine illustrating the various manual control elements of the sewing machine.

GENERAL MECHANISMS Referring to the drawings, the buttonholing device of this invention is illustrated as embodied in a zigzag sewing machine of the type which forms the subject of the U.S. Pat. No. 2,862,468, Dec. 2, 1958, of R. E. Johnson, to which reference may be had for a detailed description. The sewing machine comprises a frame including a bed 11, a hollow standard 12 rising from the bed from which extends a bracket arm 13 terminating in a sewing head 14 which overhangs the bed. Journaled in the bracket arm is a main shaft which carries a balance wheel 16 including a work wheel 17 meshing with a work 18 fast on a drive motor shaft 19. A drive motor (not shown) is preferably carried within the rear portion of the hollow standard.

Within the sewing head 14, the main shaft carries a needle reciprocating crank 20 connected by a drive link 21 to a stud 22 secured on a needle bar 23 to the lower extremity of which a needle 24 is clamped. To provide for zigzag stitching, the needle bar 23 is endwise slidable in a spherical bearing 25 in the lower extremity of the sewing head and is slidably constrained in a similar spherical bearing 26 in a gate 27 which is pivoted in the sewing head on pintles 28, of which one is illustrated in FIG. 2. A link 29 which is pivotally connected at 30 to the needle bar gate 27 serves to impart to the needle bar gate lateral vibratory movements so as to swing the needle 24 laterally in the formation of zigzag stitches.

The needle jogging mechanism of the sewing machine illustrated in the accompanying drawings includes provision for controlling the neutral position of needle vibration, and provides for the sewing of cam controlled patterns of zigzag stitching. It will be understood, however, that the buttonholing device of this invention is applicable to any sewing machine having a zigzag mechanism of the type in which the neutral position of needle vibration may be regulated, and the specific zigzag mechanism illustrated in the drawings is by way of an example of sewing mechanism to which this invention may be applied.

Lateral jogging movement is imparted to the needle bar gate by way of the link 29 from a wobble plate pivoted to the link 29 and influenced by a front follower lever 36 fulcrumed on a stud 37 in the frame and also influenced by a rear follower lever 38 fulcrumed on the stud 29 in the frame. A spring 40 which acts between the needle bar gate 27 and a lever 41 which bears against the wobble plate 35 serves to bias the wobble plate against the follower levers from the wobble plate. The follower levers against abutment means at the opposite side of the follower levers from the woblle plate. The follower levers 36 and 38 may be shifted lengthwise of the respective fulcrum studs 37 and 39 so as to cooperate with selected ones of a variety of abutment means including pattern cam disks 42 which are mounted on a cam shaft 43 in the bracket arm 13 and driven by a worm 44 and worm wheel 45 connection to the main shaft 15. The folfollower levers 36 and 3 8 may be shifted to cooperate which are stationary during the machine operation as, for instance, the concentric surfaces 46, 47 and 48 of a bight controlling lever 49 fulcrumed on the cam shaft 43. The follower levers 36 and 38 may be shifted to cooperate with selected ones of the various abutment means by the depression and adjustment of the lateral position of the control buttons 50 and 51 respectively. This cam follower position selecting mechanism forms the subject of a copending US. patent application Ser. No. 684,- 425, filed Nov. 20, 1967, to which reference may be had for a detailed explanation thereof.

The bight controlling lever 49 engages a pin 52 which protrudes from the needle bar jogging link 29 and serves to shift the wobble plate 35 laterally relatively to the follower levers 36 and 38 thus to regulate the width of zigzag stitching. A handle 53 secured to the bight controlling lever provides a finger grip for effecting bight adjustment.

Cooperating with the needle 24 in the formation of stitches is a loop taker which may be driven in timed relation with the needle reciprocation by means of the shafts 61 and 62 and the meshing gear sets 63, 64 and 65 connecting the loop taker with the main shaft 15.

Also driven from the main shaft 15 is a work feeding mechanism which, as illustrated in the drawings, may be of the conventional drop feed variety. As shown in FIG. 6,'a feed dog 70, which is opposed by a presser foot 71 supported in the sewing head 14, is imparted work feed and return movements by a feed advance rock shaft 72 in the bed 11 by way of a rock frame 73 on the feed advance rock shaft which rock frame is pivotally connected to a feed bar 74 which carries the feed dog. The feed dog is also imparted rising and falling movements into and out of engagement with the work by means of a feed lift rock shaft 75 carried in the bed 11. A rock arm 76 on the feed lift rock shaft is connected by means of a link 77 to the feed bar 74 to impart such rising and falling movements to the feed dog. As illustrated in FIGS. 1 and 2, a feed lift pitman 78 in the hollow standard 12 is driven by an eccentric 79 on the main shaft 15 and serves to impart operating movement to the feed lift rock shaft 75. Feed advance is imparted to the feed advance rock shaft 72 by a cam 80 on the main shaft 15 which is embraced by a bifurcated extremity 81 of a feed advance pitman 82 operatively connected to the feed advance rock shaft. The feed advance pitman 82 has pivoted thereto a slide block 83 which is constrained in a guide slot 84 formed in a feed regulating member 85 which is pivotally supported on a stud 86 carried in the machine frame. A feed regulating handle 87 protrudes from the feed regulating member and extends through an escutcheon plate 88 to provide operator-influenced control of the stitch length provided by the work feeding mechanism. The range of angular adjustment of the feed regulating member 85 is such as to provide for feed of the work in either direction toward or away from the opeartor with respect to the sewing needle 24.

In the sewing machine illustrated in the drawings, the standard 12 and bracket arm 13 are formed in the front wall with an opening 90 which is bounded by a protruding rib 91. The opening 90 is closed by a cover or escutcheon 92 through which the controls 50 and 51 for cam follower position selection, the controller 53 for the width of zigzag stitching, and the feed regulating handle 87 project. Any desired indicia may be provided on the 4 cover or escutcheon plate 92 for facilitating the setting of the controls, and as illustrated in FIG. 9, special indicia 93 may be provided to facilitate the settings necessary for use of the buttonholing device.

Preferably carried in the sewing machine frame within the lower front portion of the hollow standard is the buttonholing unit of this invention. The buttonholing unit is provided as a sub-assembly in a bracket which is generally U-shaped having an upstanding front limb 101 and a rear limb 102 upstanding substantially parallel to the front limb. By means of an ear 103 protruding from the front limb 101 and ears 104 and 105 protruding from the rear limb 102, the bracket 100 may be secured as by screws 106 to bosses 107 formed within the standard 12. An additional ear 108 formed on the front limb 101 of the bracket provides an anchor for the lower extremity of the feed regulator escutcheon 88.

Fast to a stud shaft 110 journaled between the limbs 101 and 102 of the bracket 100 is a cam disk 111 in the rear wall of which, as best shown in FIG. 5, is formed a face cam groove 112. The periphery of the cam disk is formed with two spaced groups of ratchet teeth 113 and 114, each group of ratchet teeth occupying a diametrically opposed quadrant of the cam disk periphery. Between the ratchet teeth groups 113 and 114, the cam disk periphery is formed with smooth surfaces.

The stud shaft 110 protrudes through the cover or escutcheon 92 and externally thereof a knob 115 is secured to the stud shaft. The knob 115 is preferably formed with diametrically opposed radial tabs 116 and 117 marked respectively with numerals 1 and 2 and on one side between the tabs marked with the work 01f. These marks cooperate with the indicia 93 on the cover or escutcheon 92 to facilitate operation of the buttonholing unit. The orientation of the knob, the ratchet teeth groups, and the cam groove 112, together with the manner in which the knob 115 must be manipulated to effect operation of the buttonholing unit, will be described hereinbelow.

As best illustrated in FIG. 7, spaced vertically elongated apertures 120 and 121 in the rear limb 102 of the bracket 100 slidably accommodate and guide screws 122 and 123 threaded into a single operating member 124. A slot 125 formed in the single operating member 124 and embracing the stud shaft 110 may also assist in constraining the single operating member to move in a predetermined path. A roller follower 126 On the screw 122 tracks the face cam groove 112 in the cam disk 111 to impart movement to the single operating member between two extreme positions along its constrained path.

Referring to FIGS. 1, 2, 4 and 8, the single operating member 124 at its upper extremity is formed with a rearwardly extending finger 127 which is apertured as at 128 slidably to accommodate a pin 129 which is formed with a pair of spaced annular head flanges 130. The pin 129 is also slidable in apertures 131 through a clevis 132 formed at the extremity of a lever 133 which is fulcrummed on the stud 86 by which the feed regulating member is pivoted to the machine frame. The rear limb 102 of the bracket 100 for the buttonholing unit is formed with an offset arm 134 to which is threaded a fulcrum screw 135 for a leaf spring keeper lever 136. The spring keeper lever includes an upstanding bifurcated arm 137 which engages between the head flanges 130 of the pin 129. Also mounted on the offset arm 134 of the bracket 100 is a stop member 138 formed with an upturned extremity 139 in which a U-shaped aperture 140 is formed. A handle 141 secured to the leaf spring keeper lever 136 by the screw 142 extends through the U-shaped aperture 140 and thus provides for the setting of two distinct positions of the pin 129 relatively to the single operating member 124. In both of the possible positions of the pin 129, the pin will be engaged in the apertures 128 of the single operating member 124 and the apertures 131 in the clevis 132 of the lever 133, but the handle 141 does provide for an axial shift of the pin 129 into and out of a position of engagement with an aperture 143 which is formed in a plate 144 which is pivotally mounted on the stud 86 for the feed regulating member 85. The plate 144 also is formed with a locating ear 145 apertured as at 146 to embrace an eccentric shoulder 147 on a headed adjusting bolt 148 which is constrained to turn in the feed regulating member 85 and which may be locked in selected position of adjustment by a set screw 149. By this arrangement, the single operating member 124 is constantly in operative connection with the lever 133 which, as will be described hereinbelow, provides for control of the neutral position of needle vibration during buttonholing, but by way of the handle 141 the single operating member 14 may be selectively coupled with the feed regulating member 85. The adjusting bolt 18 provides for a fine adjustment of the relationship between the position of the feed regulating member 85 and the single operating member 124 of the 'buttonholing unit so that during buttonholing, a fine adjustment of the relationship between the forward and rearward stitch lengths may be effected.

For influencing the neutral position of needle vibration during buttonholing, the lever 133 carries a pin 160 which engages a slot 161 formed in a rock arm 162 fast on a rock shaft 163 which is journaled in the spaced upstanding arms 164 of a support bracket 165 secured by screws 166 within the sewing machine bracket arm 13. A rock arm 167 fast on the opposite extremity of the rock shaft 163 extends opposite to a finger 168 which protrudes from the rear follower lever 38 of the needle jogging mechanism in the sewing machine. As the single operating member 124 of the buttonholing unit is shifted between the two extreme positions therefor, the rock arm 167 will be shifted alternately to release the rear cam follower 38 for an engagement with the abutment means such as the abutment means 48 which is a part of the regular needle jogging mechanism, or the rock arm 167 will be shifted so as to engage the finger 168 of the follower 38 to shift the cam follower out of engagement with the regular abutment means into a special position suitable for producing a portion of a buttonhole.

As shown in FIGS. 1, 2 and 4, a bell crank lever 170 is fulcrummed on the stud shaft 110 and has pivoted at one extremity by a shouldered screw 171 a pawl 172 which is biased by a spring 173 into engagement with the periphery of the cam disk 111. The other extremity of the bell crank lever 170 is slotted as at 175 and accommodates a pin 176 which extends from a block 177 secured to the feed lift actuating pitman 78.

When the cam disk 111 is turned, as by operator influence of the knob 115, to bring one of the ratchet teeth groups 113 or 114 into engagement with the pawl 172, the cam disk 111 will be indexed in a series of steps approximately a quarter turn until the pawl shifts onto a smooth portion of the cam disk periphery. The cam disk will then remain stationary until again moved by the operator to bring the other ratchet teeth group into cooperation with the pawl. A spring detent 178 secured by a screw 179 on the bracket 100 cooperates with notches 180, 181 and 182 formed in the cam disk 111 to provide identifiable settings for the knob 115. The notch 180 indicates, by an audible click and slight resistance to further turning, that the knob is fully into a position with the tab marked 1 opposite the indicia 93, and in this position the pawl 172 will cooperate with the ratchet teeth group 113. The notch 181 locates the position of the knob with the pawl in cooperation with the ratchet teeth group 114, and the notch 182 locates the knob in the off position.

Since the cam disk 111 is driven by upward movements of the feed lift pitman 78 and since such feed lift actuation is conventionally timed to occur as the needle emerges from the work, the increments of motion of the cam disk 111, when driven, will occur while the needle is out of the work.

With reference to FIG. 5, the cam groove 112 in the cam disk 111 is preferably in relation with the ratchet teeth groups 113 and 114 so as to provide a gradual change of cam groove radius to be tracked 'by the roller follower 126 during each interval of cam drive by way of the pawl 172, i.e. with the cam groove decreasing in radius in the portion 190 while the ratchet teeth group 113 is engaged by the pawl, and the cam groove increasing radius in the portion 191 while the ratchet teeth group 114 is engaged by the pawl. The cam groove tracked by the roller follower between the quadrant portions 190 and 191 may be substantially constant radius, or if preferred, the radius may be increased or decreased only slightly to remove lost motion between the parts before the cam groove portions 190 and 191 become effective.

With particular reference to FIGS. 3A, B, C, and D, the operation of the buttonholing device of this invention in the sewing machine illustrated in the accompanying drawings will now be described. When the sewing machine controls are set for normal stitching operations, the handle 141 will occupy the right hand position as illustrated in the drawings, and the pin 129 will be out of engagement with the aperture 143 in the plate 144 on the feed regulating member. To produce a buttonhole using the buttonhole unit of this invention, the handle 141 must first be shifted into the left hand position as illustrated in FIGS. 4 and 9. As the pin 129 is not in alignment with the aperture 143, the leaf spring keeper lever 136 will yield and provide a biasing force urging the pin against the plate 144 and when the feed. regulating handle 87 is shifted to bring the aperture 143 into alignment herewith, i.e. opopsite the indicia 93 as shown in FIG. 9, the pin 129 snaps into engaged position. The bight adjusting handle 53 is preferably set to a position dictating a bight of slightly less than half the capacity of the needle jogging mechanism. The button 51 is set so as to position the rear follower lever 38 into cooperative relation with the concentric surface 48 which is that abutment surface which dictates an extreme right hand neutral position of needle vibration. By this is meant that as the width or bight of zi'gzaging is decreased to zero, the needle will occupy a position on the right hand side of the field of zigzag stitches. To form a buttonhole, the knob 115 is turned to position the tab marked 1 opposite the indicia 93 on the escutcheon 92. Referring to FIG. 5, this will bring the ratchet teeth 113 into cooperative relation with the driving pawl 172 to index the cam disk 111 in a series of steps extending over a number of stitches so that the roller follower 126 will track the cam groove portion 190 and thereby shift the single operating member 124 from the upper to the lower extreme position. The movement of the single operating member 124 from one extreme position to another will carry the feed regulating member gradually from a position of rearward work feed control through a position of zero feed of the work and into a position of forward feed of the work. Simultaneously, the rock arm 167 will shift the follower lever 38 from a right hand into a left hand neutral position of needle vibration. As shown in FIG. 3A, this operation will produce a round end of a buttonhole and when the pawl 172 thereafter in moving over a plain peripheral surface of the cam disk ceases to index the cam disk, the sewing machine will remain in a position of adjustment to produce a straight seam of zigzag stitches which constitute one side of the buttonhole as illustrated in FIG. 3B. The operator of the machine by visually monitoring the machine operation may thus stitch any length buttonhole that is desired. When the proper length of one side seam of the buttonhole has been produced, the operator need merely shift the knob to bring the tab marked 2 into registry with the indicia 93 on the escutcheon. The second ratchet teeth group 114 will then be brought into cooperative relation with the pawl 172, and operation of the sewing machine will then cause the cam disk 111 to be indexed in a series of steps during which the cam groove portion 191 will shift the single operating member 124 from the lower to the upper extremity of its range of positions. The opposite end of a buttonhole will be produced automatically during this second series of motions of the cam disk 111 as illustrated in FIG. 30. When the pawl 172 completes the ratcheting of the teeth in the group 114 and rides idly over the smooth peripheral portion of the cam disk, the sewing mechanism will remain in a position of adjustment to feed the work in the reverse direction and to produce a straight line of zigzag stitches comprising the opposite side of the buttonhole. The operator need only monitor the sewing machine operation so as to cease the sewing when the side stitching reaches the initially formed end of the buttonhole as illustrated in FIG. 3D. When the buttonhole has been completed, the knob 115 will occupy a position in which the mark Off will be in register with the indicia 93 on the escutcheon. In this position, the rock arm 167 will have been shifted relatively to the finger 168 on the rear cam follower lever 38 so as to be out of engagement therewith, leaving the cam follower 38 to cooperate With the regular abutment means of the needle jogging mechanism. In this position of parts, the buttonholing unit will have no effect upon the needle jogging mechanism of the sewing machine and thus, if the buttonholing mechanism is decoupled from the feed regulating member 85, by a shift of the handle 141 to the right, as illustrated in the drawings, to urge the pin 129 out of engagement with the aperture 143 in the plate 144, the buttonholing unit will have no effect whatever on the entire range of the zigzagging capability of the needle nor upon the entire range of manually controllable positions of the work feeding mechanism of the sewing machine.

Having thus set forth the nature of the invention, what is claimed herein is:

1. A buttonholing device for azigzag sewing machine having an endwise reciprocatory needle bar, mechanism for jogging said needle bar laterally to produce zigzag stitches including a member regulating the neutral position of needle jogging motion, a work feeding mechanism including a feed regulating member having a range of positions corresponding to forward and reverse directions of work feed, and actuating mechanism in said sewing machine operatively connected to impart endwise reciprocatory and laterally vibratory movements to said needle bar and movements to said work feeding mechanism in timed relation thereto, said buttonholing device comprising rotary cam means supported on said sewing machine, drive means operated by said sewing machine actuating mechanism forv imparting turning movement in step wise increments to said rotary cam means in predetermined and spaced fractions of each revolution of said rotary cam means, an operator influenced handle secured to said rotary cam means for turning said rotary cam means through the intervals betwen said predetermined and spaced fractions of each revolution, a single operating member guided to move between extreme positions along a constrained path, a follower carried by said operating member in tracking relation with said rotary cam means, linkage in said sewing machine operatively connecting said member regulating the neutral positionv of needle jogging motion with said single operating member in only one extreme position of said operating member, and a manually separable connection between said single operating member and said feed regulating member.

2. A buttonholing device as set forth in claim 1 in which said rotary cam means comprises a cam disk formed in one face with a closed cam groove, and in which said drive means comprises an oscillating pawl operated by said sewing machine actuating mechanism, and ratchet teeth arranged in diametrically opposed quadrants of said cam disk periphery and formed to accommodate step-wise engagement by said oscillating pawl.

3. A buttonholing device as set forth in claim 2 in which said closed cam groove in said cam disk is formed with respect to said drive means and with respect to said follower so as to impart movement to said single operating member from one to another of said extreme positions during step-wise engagement of said pawl with each of said diametrically opposed ratchet teeth quadrants of said cam disk.

4. A buttonholing device as set forth in claim 1 in which said member in said sewing machine needle jogging mechanism for regulating the neutral position of needle jogging motion comprises a lever, the angular position of which determines the neutral position of needle jogging motion, spring means biasing said lever in one direction against abutment means forming part of said needle jogging mechanism for determining neutral position of needle jogging motion, and in which said linkage operatively connecting said lever with said single operating member of said buttonholing device terminates in a contact arm engageable with said lever in said only one extreme position of said operating member and effective to shift said lever against the bias of said spring means out of engagement with said abutment means.

5. A buttonholing device as set forth in claim 1 which includes a bracket having means for attachment to said sewing machine, bearing means on said bracket supporting said rotary cam means, means on said bracket supporting said drive means for said rotary cam means, guide means formed on said bracket for constraining said single operating member to move along said constrained path, and a setting device carried on said bracket sustaining said manually separable connection between said single operating member and said feed regulating member.

6. A buttonholing device as set forth in claim 5 in which said sewing machine work feeding mechanism is a drop feed mechanism including feed lift drive connections from said sewing machine actuating mechanism for raising and dropping said work feeding mechanism into and out of engagement with a work fabric being stitched, and in which said drive means for turning said rotary cam means of said buttonholing device is derived from said feed lift drive connections.

7. A buttonholing device as set forth in claim 1 in which said feed regulating member is formed with a guide slot tracked by a slide block carried by the operative connections from said actuating mechanism for imparting movements to said work feeding mechanism, and a stud pivotally supporting said feed regulating member in said sewing machine, in which said linkage operatively connecting said member regulating the neutral position of needle jogging motion with said single operating member includes a lever fulcrummed on said stud pivotally supporting said feed regulating member, and an axially shiftable pin pivotally connecting said lever with said single operating member, and in which said manually separable connection between said single operating member and said feed regulating member comprises a plate pivoted on said stud, adjacent to said feed regulating member, means for securing said plate to said feed regulating member in a selected position within a range of angular positions about said stud, said plate being formed with an aperture snuggly accommodating said axially shiftable pin.

References Cited UNITED STATES PATENTS 3,149,591 9/1964 Shigeo Aiki et al. 1l2158 3,444,832 5/1969 Gray l12158 RICHARD J. SCANLAN, JR., Primary Examiner 

